MHTCET 16 May 2024 Shift 1 Paper

Concept:A dicarboxylic acid contains two $-\mathrm{COOH}$ groups, while a monocarboxylic acid contains only one.Explanation:Adipic acid has the formula $\mathrm{HOOC}-\left(\mathrm{CH}_{2}\right)_{4}-\mathrm{COOH}$, so it contains two carboxylic acid groups.Glutaric acid has the formula $\mathrm{HOOC}-\left(\mathrm{CH}_{2}\right)_{3}-\mathrm{COOH}$, which also has two $-\mathrm{COOH}$ groups.Malonic acid has the formula $\mathrm{HOOC}-\mathrm{CH}_{2}-\mathrm{COOH}$, containing two carboxylic acid groups.Valeric acid has the formula $\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{3}\mathrm{COOH}$, which contains only one $-\mathrm{COOH}$ group, making it a monocarboxylic acid.Therefore, valeric acid is the only compound that is not a dicarboxylic acid.Answer:Valeric acid (Option B) is NOT a dicarboxylic acid.